CN112234770B - Oil-cooled motor control device and method - Google Patents

Oil-cooled motor control device and method Download PDF

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Publication number
CN112234770B
CN112234770B CN201910636889.5A CN201910636889A CN112234770B CN 112234770 B CN112234770 B CN 112234770B CN 201910636889 A CN201910636889 A CN 201910636889A CN 112234770 B CN112234770 B CN 112234770B
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oil
temperature
cooled motor
control target
lubricating oil
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CN112234770A (en
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黄鑫
李孟德
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K9/00Arrangements for cooling or ventilating
    • H02K9/19Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/64Electric machine technologies in electromobility

Abstract

The application discloses an oil-cooled motor control device and method, relates to the field of electric automobiles, and is used for controlling the working temperature of an oil-cooled motor. Oil-cooled motor temperature control device includes: the device comprises an oil pump, a heat exchanger, a water pump, a controller and an oil collecting tank; the controller is used for: acquiring the temperature of lubricating oil in the oil collecting tank; predicting the predicted working condition of the oil-cooled motor according to at least one of the driving mode, the predicted road condition and the driving habit; determining a temperature control target of lubricating oil and a temperature control target of the oil-cooled motor according to the predicted working condition of the oil-cooled motor; controlling the rotating speed of the oil pump according to the predicted working condition of the oil-cooled motor, the temperature control target of the oil-cooled motor and the temperature control target of the lubricating oil; and controlling the rotating speed of the water pump according to the temperature of the cooling liquid flowing into the heat exchanger, the temperature of the lubricating oil in the oil collecting tank, the flow rate of the lubricating oil and the temperature control target of the lubricating oil.

Description

Oil-cooled motor control device and method
Technical Field
The application relates to the field of electric automobiles, in particular to an oil-cooled motor control device and method.
Background
With the gradual rise of the environmental protection consciousness of people, the electric automobile is increasingly popular in the market as an environment-friendly and clean vehicle. The motor is used as a core component of an electric automobile power system, heat is inevitably generated in the operation process, if the heat cannot be dissipated in time, the aging of internal components of the motor is accelerated if the heat is light, and the motor is burnt if the heat is heavy, so that accidents are caused.
The mainstream electric automobile motor in the current market is cooled by water, and the water channel is arranged on the outer surface of the shell of the motor, so that the heat exchange between the outer shell of the motor and the cooling water is utilized to dissipate the heat of the motor. The mode has simple structure and convenient design, but has limited heat dissipation effect, thus leading to low power density of the motor. Recently, an oil cooling method is being developed, and unlike a water cooling method in which heat exchange is performed only in an outer casing of a motor, an oil-resistant material is used in an oil cooling method in which a lubricant oil is directly circulated in the motor, and heat exchange is directly performed with each sub-component (such as a stator core, a stator winding, a rotor core, etc.) in the motor.
When the oil-cooled motor operates under different working conditions, the corresponding losses are different, and the generated heat is also different, so that the internal temperature change range of the motor is larger. At this time, the magnetic field level of the permanent magnet of the motor rotor changes with the temperature change, thereby causing the control accuracy of the output torque to be reduced. If the temperature of the lubrication oil is not controlled, it may cause the oil temperature to be too high or too low. If the temperature of the lubricating oil is too low, the viscosity of the oil will increase greatly, causing an increase in the drag of the reduction gear and a decrease in efficiency. If the temperature of the lubricating oil is too high, the cooling effect of the bearing is poor, and the service life of the bearing is shortened.
Disclosure of Invention
The embodiment of the application provides a control method and device for an oil-cooled motor, which are used for controlling the working temperature of the oil-cooled motor.
In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:
in a first aspect, an oil-cooled motor temperature control device is provided, including: the device comprises an oil pump, a heat exchanger, a water pump, a controller and an oil collecting tank; the oil collecting tank is used for collecting the lubricating oil subjected to heat exchange in the oil-cooled motor; the oil pump is used for pumping the lubricating oil flowing in the oil-cooled motor into the heat exchanger from the oil collecting tank and then refluxing the lubricating oil to the oil-cooled motor, and controlling the flow of the lubricating oil; the heat exchanger is used for exchanging heat between the lubricating oil and the cooling liquid; the water pump is used for controlling the flow of the cooling liquid in the heat exchanger; the controller is used for: acquiring the temperature of lubricating oil in the oil collecting tank; predicting the predicted working condition of the oil-cooled motor according to at least one of the driving mode, the predicted road condition and the driving habit; determining a temperature control target of lubricating oil and a temperature control target of the oil-cooled motor according to the predicted working condition of the oil-cooled motor, wherein the temperature control target of the lubricating oil refers to a temperature control target of the lubricating oil flowing out of the heat exchanger; controlling the rotating speed of the oil pump according to the predicted working condition of the oil-cooled motor, the temperature control target of the oil-cooled motor and the temperature control target of the lubricating oil; and controlling the rotating speed of the water pump according to the temperature of the cooling liquid flowing into the heat exchanger, the temperature of the lubricating oil in the oil collecting tank, the flow rate of the lubricating oil and the temperature control target of the lubricating oil.
The oil-cooled motor control device provided by the embodiment of the application acquires the temperature of lubricating oil in the oil collecting tank; predicting the predicted working condition of the oil-cooled motor according to at least one of the driving mode, the predicted road condition and the driving habit; determining a temperature control target of lubricating oil and a temperature control target of the oil-cooled motor according to the predicted working condition of the oil-cooled motor; controlling the rotating speed of the oil pump according to the predicted working condition of the oil-cooled motor, the temperature control target of the oil-cooled motor and the temperature control target of the lubricating oil; and controlling the rotating speed of the water pump according to the temperature of the cooling liquid flowing into the heat exchanger, the temperature of the lubricating oil in the oil collecting tank, the flow rate of the lubricating oil and the temperature control target of the lubricating oil. The temperature of the lubricating oil in the oil-cooled motor is controlled, so that the working temperature of the oil-cooled motor is controlled.
In one possible embodiment, the oil-cooled motor temperature control device further comprises a first temperature sensor disposed at a bottom of the oil sump to measure a temperature of the lubricating oil in the oil sump, and the controller is specifically configured to: and acquiring the temperature of the lubricating oil in the oil collecting tank through the first temperature sensor. This embodiment provides a way of obtaining the temperature of the lubricating oil in the oil sump, which is relatively accurate.
In a possible embodiment, the oil-cooled motor temperature control device further includes a second temperature sensor disposed in a stator winding of the oil-cooled motor to measure an operating temperature of the oil-cooled motor, and the controller is specifically configured to: acquiring the working temperature of the oil-cooled motor through a second temperature sensor; and calculating according to the working temperature of the oil-cooled motor or inquiring a calibration table to obtain the temperature of the lubricating oil in the oil collecting tank. This embodiment provides a way of obtaining the temperature of the lubricating oil in the sump. This embodiment provides an alternative way of obtaining the temperature of the lubricating oil in the sump, which may be less costly than providing a temperature sensor in the sump.
In one possible embodiment, the controller is specifically configured to: determining a flow control target of the cooling liquid according to the temperature of the cooling liquid flowing into the heat exchanger, the temperature of the lubricating oil flowing into the heat exchanger, the flow rate of the lubricating oil and a temperature control target of the lubricating oil; and controlling the rotating speed of the water pump according to the flow control target of the cooling liquid.
In one possible embodiment, the controller is specifically configured to: obtaining the heat productivity of the oil cooling motor according to the predicted working condition of the oil cooling motor; determining the actual working condition of the oil cooling motor according to the heat productivity of the oil cooling motor; if the actual working condition of the oil-cooled motor is the first working condition, obtaining a flow control target of the lubricating oil according to the heat productivity of the oil-cooled motor, a temperature control target of the oil-cooled motor and the temperature control target of the lubricating oil, and controlling the rotating speed of the oil pump according to the flow control target of the lubricating oil; and if the actual working condition of the oil-cooled motor is the second working condition, increasing the rotating speed of the oil pump. The flow rate of the lubricating oil is controlled, so that the oil-cooled motor can be cooled. In particular, the rotation speed of the oil pump can be set to the maximum.
In one possible embodiment, the controller is further configured to: and if the actual working condition of the oil-cooled motor is the second working condition, increasing the rotating speed of the water pump. The heat exchange efficiency of the heat exchanger can be improved, and the lubricating oil is cooled. In particular, the speed of the water pump can be set to the maximum.
In one possible embodiment, the controller is specifically configured to: obtaining heating value compensation quantity according to a temperature control target of the oil cooling motor and the working temperature of the oil cooling motor; obtaining the heat productivity of the compensated oil cooling motor according to the heat productivity and the heat productivity compensation quantity of the oil cooling motor; and obtaining a flow control target of the lubricating oil according to the compensated heat productivity of the oil cooling motor, the temperature control target of the oil cooling motor and the temperature control target of the lubricating oil. The implementation mode essentially realizes negative feedback through closed-loop control, and can greatly improve the temperature control precision of the oil-cooled motor.
In one possible embodiment, the controller is specifically configured to: obtaining the compensated temperature of the oil-cooled motor according to the working temperature and the temperature rise of the oil-cooled motor; obtaining heating compensation quantity according to the temperature control target of the oil cooling motor and the compensated temperature of the oil cooling motor; the temperature rise is obtained according to the heat productivity compensation quantity, the specific heat capacity and the mass of the stator core, the specific heat capacity and the mass of the stator winding and the specific heat capacity and the mass of the rotor.
In a possible implementation manner, the heating value of the oil-cooled motor corresponding to the first working condition is lower than a first value, and the heating value of the oil-cooled motor corresponding to the second working condition is higher than a second value; the temperature control target of the lubricating oil corresponding to the first working condition is higher than that of the lubricating oil corresponding to the second working condition, and the temperature control target of the oil-cooled motor corresponding to the first working condition is higher than that of the oil-cooled motor corresponding to the second working condition.
In a second aspect, there is provided an oil-cooled motor temperature control method applied to the oil-cooled motor temperature control apparatus according to the first aspect and any embodiment thereof, the method including: acquiring the temperature of lubricating oil in the oil collecting tank; predicting the predicted working condition of the oil-cooled motor according to at least one of the driving mode, the predicted road condition and the driving habit; determining a temperature control target of lubricating oil and a temperature control target of the oil-cooled motor according to the predicted working condition of the oil-cooled motor, wherein the temperature control target of the lubricating oil refers to a temperature control target of the lubricating oil flowing out of the heat exchanger; controlling the rotating speed of the oil pump according to the predicted working condition of the oil-cooled motor, the temperature control target of the oil-cooled motor and the temperature control target of the lubricating oil; and controlling the rotating speed of the water pump according to the temperature of the cooling liquid flowing into the heat exchanger, the temperature of the lubricating oil in the oil collecting tank, the flow rate of the lubricating oil and the temperature control target of the lubricating oil.
According to the control method of the oil-cooled motor, the temperature of lubricating oil in the oil collecting tank is obtained; predicting the predicted working condition of the oil-cooled motor according to at least one of the driving mode, the predicted road condition and the driving habit; determining a temperature control target of lubricating oil and a temperature control target of the oil-cooled motor according to the predicted working condition of the oil-cooled motor; controlling the rotating speed of the oil pump according to the predicted working condition of the oil-cooled motor, the temperature control target of the oil-cooled motor and the temperature control target of the lubricating oil; and controlling the rotating speed of the water pump according to the temperature of the cooling liquid flowing into the heat exchanger, the temperature of the lubricating oil in the oil collecting tank, the flow rate of the lubricating oil and the temperature control target of the lubricating oil. The temperature of the lubricating oil in the oil-cooled motor is controlled, so that the working temperature of the oil-cooled motor is controlled.
In one possible embodiment, obtaining the temperature of the lubricating oil in the oil sump comprises: and acquiring the temperature of the lubricating oil in the oil collecting tank through the first temperature sensor. This embodiment provides a way of obtaining the temperature of the lubricating oil in the oil sump, which is relatively accurate.
In one possible embodiment, obtaining the temperature of the lubricating oil in the oil sump comprises: acquiring the working temperature of the oil-cooled motor through a second temperature sensor; and calculating according to the working temperature of the oil-cooled motor or inquiring a calibration table to obtain the temperature of the lubricating oil in the oil collecting tank. This embodiment provides an alternative way of obtaining the temperature of the lubricating oil in the sump, which may be less costly than providing a temperature sensor in the sump.
In one possible embodiment, the controlling the rotation speed of the water pump according to the temperature of the coolant flowing into the heat exchanger, the temperature of the lubricating oil in the oil sump, the flow rate of the lubricating oil, and the temperature control target of the lubricating oil includes: determining a flow control target of the cooling liquid according to the temperature of the cooling liquid flowing into the heat exchanger, the temperature of the lubricating oil flowing into the heat exchanger, the flow rate of the lubricating oil and a temperature control target of the lubricating oil; and controlling the rotating speed of the water pump according to the flow control target of the cooling liquid.
In one possible embodiment, the controlling the rotation speed of the oil pump according to the predicted operating condition of the oil-cooled motor, the temperature control target of the oil-cooled motor, and the temperature control target of the lubricating oil includes: obtaining the heat productivity of the oil cooling motor according to the predicted working condition of the oil cooling motor; determining the actual working condition of the oil cooling motor according to the heat productivity of the oil cooling motor; if the actual working condition of the oil-cooled motor is the first working condition, obtaining a flow control target of the lubricating oil according to the heat productivity of the oil-cooled motor, a temperature control target of the oil-cooled motor and the temperature control target of the lubricating oil, and controlling the rotating speed of the oil pump according to the flow control target of the lubricating oil; and if the actual working condition of the oil-cooled motor is the second working condition, increasing the rotating speed of the oil pump. The flow rate of the lubricating oil is controlled, so that the oil-cooled motor can be cooled. In particular, the rotation speed of the oil pump can be set to the maximum.
In one possible embodiment, the method further comprises: and if the actual working condition of the oil-cooled motor is the second working condition, increasing the rotating speed of the water pump. The heat exchange efficiency of the heat exchanger can be improved, and the lubricating oil is cooled. In particular, the speed of the water pump can be set to the maximum.
In one possible embodiment, obtaining the target for flow control of the lubricating oil according to the heat generation amount of the oil-cooled motor, the target for temperature control of the oil-cooled motor, and the target for temperature control of the lubricating oil includes: obtaining heating value compensation quantity according to a temperature control target of the oil cooling motor and the working temperature of the oil cooling motor; obtaining the heat productivity of the compensated oil cooling motor according to the heat productivity and the heat productivity compensation quantity of the oil cooling motor; and obtaining a flow control target of the lubricating oil according to the compensated heat productivity of the oil cooling motor, the temperature control target of the oil cooling motor and the temperature control target of the lubricating oil. The implementation mode essentially realizes negative feedback through closed-loop control, and can greatly improve the temperature control precision of the oil-cooled motor.
In a possible embodiment, obtaining the heating value compensation amount according to the temperature control target of the oil-cooled motor and the operating temperature of the oil-cooled motor includes: obtaining the compensated temperature of the oil-cooled motor according to the working temperature and the temperature rise of the oil-cooled motor; obtaining heating compensation quantity according to the temperature control target of the oil cooling motor and the compensated temperature of the oil cooling motor; the temperature rise is obtained according to the heat productivity compensation quantity, the specific heat capacity and the mass of the stator core, the specific heat capacity and the mass of the stator winding and the specific heat capacity and the mass of the rotor.
In a possible implementation manner, the heating value of the oil-cooled motor corresponding to the first working condition is lower than a first value, and the heating value of the oil-cooled motor corresponding to the second working condition is higher than a second value; the temperature control target of the lubricating oil corresponding to the first working condition is higher than that of the lubricating oil corresponding to the second working condition, and the temperature control target of the oil-cooled motor corresponding to the first working condition is higher than that of the oil-cooled motor corresponding to the second working condition.
In a third aspect, there is provided a computer-readable storage medium having stored therein instructions which, when run on a computer or processor, cause the computer or processor to perform a method as in the second aspect or any one of its possible embodiments.
In a fourth aspect, there is provided a computer program product comprising instructions which, when run on a computer or processor, cause the computer or processor to perform the method as in the second aspect or any of its possible embodiments.
Technical effects of the third to fourth aspects may be as described with reference to the second aspect and various possible embodiments thereof.
Drawings
Fig. 1 is a schematic structural diagram of an oil-cooled motor system according to an embodiment of the present disclosure;
fig. 2 is a first schematic flow chart of a method for controlling a temperature of an oil-cooled motor according to an embodiment of the present disclosure;
fig. 3 is a schematic flow chart illustrating a second method for controlling the temperature of the oil-cooled motor according to the embodiment of the present disclosure;
fig. 4 is a schematic diagram of closed-loop control of the operating temperature of the oil-cooled motor according to an embodiment of the present disclosure;
fig. 5 is a third schematic flowchart of a method for controlling a temperature of an oil-cooled motor according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram of a temperature variation curve of an oil-cooled motor at peak power according to an embodiment of the present disclosure;
fig. 7 is a schematic diagram of output torques at different operating temperatures of an oil-cooled motor according to an embodiment of the present application.
Detailed Description
The embodiment of the application provides an oil-cooled motor control device and method, wherein heat exchange is carried out on lubricating oil and cooling liquid in a heat exchanger, a water pump controls the flow of the cooling liquid, and an oil pump controls the flow of the lubricating oil. And predicting the predicted working condition of the oil-cooled motor according to at least one of the driving mode, the predicted road condition and the driving habit, and determining the temperature control target of the lubricating oil and the temperature control target of the oil-cooled motor according to the predicted working condition of the oil-cooled motor so as to adjust the rotating speeds of the water pump and the oil pump. The temperature of lubricating oil in the oil-cooled motor is controlled, so that the working temperature of the oil-cooled motor is controlled.
As shown in fig. 1, the present application provides an oil-cooled motor system comprising: an oil-cooled motor control device 11, an oil-cooled motor 12 and a reducer gear 13.
The oil-cooled motor 12 may be a permanent magnet synchronous motor, an asynchronous induction motor, or the like. The oil-resistant material is adopted in the oil-cooled motor 12, the lubricating oil directly circulates in the motor, and directly exchanges heat with various sub-components (such as the stator core 121, the stator winding 122, the rotor core 123 and the like) in the motor, and the heat dissipation efficiency is higher than that of a water-cooled motor.
The oil-cooled motor control device 11 includes: an oil pump 111, a heat exchanger 112, a water pump 113, a controller 114, a first temperature sensor 115, a second temperature sensor 116, a sump 117, and a filter 118.
The lubricating oil in the oil-cooled motor flows through the stator surface via the oil passage and is sprayed to the stator core 121, the stator winding 122, the rotor core 123, the reduction gear 13, and the bearing 124. The lubricating oil flows into the oil collecting groove 117 under the action of gravity after exchanging heat with the oil-cooled motor, and then enters the heat exchanger 112 through the oil passage via the filter 118 to exchange heat with the cooling liquid under the action of the oil pump 111. After that, the cooled lubricating oil flows into the oil passage again to cool the oil-cooled motor 12 and the reduction gear 13.
The oil sump 117 is used for collecting the lubricating oil which is subjected to heat exchange inside the oil-cooled motor 12.
The oil pump 111 is used for pumping the lubricating oil flowing inside the oil-cooled motor 12 from the oil collecting tank 117 into the heat exchanger 112 and then returning the lubricating oil to the oil-cooled motor 12, and controlling the flow rate of the lubricating oil.
The heat exchanger 112 is used to exchange heat between the lubricating oil and the coolant.
The water pump 113 is used to control the flow rate of the coolant in the heat exchanger 112.
The first temperature sensor 115 may be disposed at the bottom of the oil sump 117 or in an oil passage between the oil pump 111 and the heat exchanger 112 for measuring the temperature of the lubricating oil in the oil sump 117.
A second temperature sensor 116 may be placed in the stator winding 122 of the oil-cooled motor 12 for measuring the operating temperature of the oil-cooled motor 12.
The controller 114 may be a Vehicle Control Unit (VCU) configured to perform the following oil-cooled motor temperature control method:
as shown in fig. 2, the method for controlling the temperature of the oil-cooled motor includes steps S201 to S205:
s201, obtaining the temperature of the lubricating oil in the oil collecting tank.
In one possible embodiment, the controller may acquire the temperature of the lubricating oil in the oil sump via the first temperature sensor.
In another possible embodiment, the controller may acquire the operating temperature of the oil-cooled motor through a second temperature sensor; and calculating according to the working temperature of the oil-cooled motor or inquiring a calibration table to obtain the temperature of the lubricating oil in the oil collecting tank. Because the lubricating oil directly gets into the oil catch bowl after flowing out oil-cooled motor, so the temperature of lubricating oil in the oil catch bowl is strongly correlated with the operating temperature of oil-cooled motor, consequently can calculate based on the temperature model and obtain or inquire calibration table and obtain the temperature of lubricating oil in the oil catch bowl.
S202, predicting the predicted working condition of the oil-cooled motor according to at least one of the driving mode, the predicted road condition and the driving habit.
Some concepts involved in this step are described first.
The driving mode is as follows:
the driving mode includes, for example, a normal mode and a sport mode. Typically, a separate physical button or virtual button in a control screen of the vehicle is provided for the driver to manually select the driving mode of the vehicle. The driving mode includes a normal mode and a sport mode.
The controller judges the driving mode of the vehicle by detecting the corresponding zone bit. For example, 0 represents a normal mode and 1 represents a motion mode.
In the sport mode, the settings related to the driving feeling in the vehicle are biased to the sport setting, such as gear shifting logic of a gearbox, steering power-assisted hand feeling, suspension feeling and the like. Compared with the common mode, the motion mode has the advantage that the oil-cooled motor has larger heat productivity.
Predicting road conditions:
the controller may predict the road condition based on the road information output by the map navigation system. The road information may include: slope, length of slope, etc. The predicted road conditions include normal road conditions and poor road conditions.
For example, the controller may obtain the traffic information within 5km ahead of the map navigation system output. And if the slope length is more than 1km and the average slope is more than 10 degrees, determining that the front is the bad road condition. And if the slope length is not more than 1km or the average slope is not more than 10 degrees, determining that the front is the normal road condition.
Take a winding mountain road with an average slope of 12 degrees and continuous upward mountains of 2km as an example: the length of the slope is more than 1km, and the average slope is 12 degrees and more than 10 degrees, so that the front severe road condition is determined.
Driving habits:
the controller can be in daily driving process, and the continuous driving data of gathering includes for example speed of a motor vehicle, lateral acceleration, time, on-vehicle music, map information etc to drive data upload to the high in the clouds that gathers. The cloud end trains an artificial intelligence neural network according to the collected driving data, and the controller acquires the trained neural network from the cloud end. The controller collects driving data at the current moment and judges the driving habits of the driver according to the neural network. The driving habits include violent driving and normal driving.
Predicting the working condition:
the predicted working conditions of the oil-cooled motor can refer to the rotating speed, the torque and the like of the oil-cooled motor.
The predicted working condition of the oil-cooled motor comprises a first working condition and a second working condition, the calorific capacity of the oil-cooled motor corresponding to the first working condition is lower than a first value, and the calorific capacity of the oil-cooled motor corresponding to the second working condition is higher than a second value. The first value is less than or equal to the second value.
The first value and the second value may be determined based on the drive test result. For example, the first value may be an upper limit value of the heating value measured when the driving mode is the normal mode, the road condition is predicted to be normal, and the driving habit is normal driving. For the second value, the calorific value of the oil-cooled motor may be measured when the driving mode is the sport mode, the calorific value of the oil-cooled motor may be measured when the road condition is predicted to be a bad road condition, the calorific value of the oil-cooled motor may be measured when the driving habit is a heavy driving, and then the lower limit value of the calorific value of the oil-cooled motor measured three times may be taken as the second value.
When any one of the following conditions is met, the predicted working condition of the oil-cooled motor is a second working condition: the driving mode is a motion mode, the road condition is predicted to be a bad road condition, and the driving habit is fierce driving. Otherwise, the predicted working condition of the oil-cooled motor is the first working condition. That is, the first operating condition satisfies all of the following conditions: the driving mode is a common mode, the road condition is predicted to be normal, the driving habit is normal driving, and the like. The specific judgment logic is shown in table 1.
TABLE 1
Motion pattern Bad road conditions Violent driving Predicting operating conditions
Is that Is irrelevant Is irrelevant Second operating mode
Is irrelevant Is that Is irrelevant Second operating mode
Is irrelevant Is irrelevant Is that Second operating mode
Whether or not Whether or not Whether or not First operating mode
And S203, determining a temperature control target of the lubricating oil and a temperature control target of the oil-cooled motor according to the predicted working condition of the oil-cooled motor.
The temperature control target of the lubricating oil refers to a temperature control target of the lubricating oil flowing out of the heat exchanger (i.e., flowing into the oil-cooled motor). The temperature control target of the oil-cooled motor refers to a temperature control target of a stator winding of the oil-cooled motor.
The temperature control target of the lubricating oil corresponding to the first working condition is higher than that of the lubricating oil corresponding to the second working condition, and the temperature control target of the oil-cooled motor corresponding to the first working condition is higher than that of the oil-cooled motor corresponding to the second working condition. That is, when the calorific value of the oil-cooled motor under the first working condition is low, the temperature control target of the lubricating oil and the temperature control target of the oil-cooled motor can be set to be high values, and overheating of the oil-cooled motor can not be caused; when the heating value of the oil-cooled motor under the second working condition is high, the temperature control target of the lubricating oil and the temperature control target of the oil-cooled motor can be set to be low values, so that the heat dissipation efficiency is improved.
For example, the temperature control target of the lubricating oil corresponding to the first working condition is 90 ℃, and the temperature control target of the oil-cooled motor is 130 ℃. The temperature control target of the lubricating oil corresponding to the second working condition is 70 ℃, and the temperature control target of the oil-cooled motor is 110 ℃.
And S204, controlling the rotating speed of the oil pump according to the predicted working condition of the oil-cooled motor, the temperature control target of the oil-cooled motor and the temperature control target of the lubricating oil.
Firstly, calibrating a relation table between the predicted working conditions (such as rotating speed and torque) and the heat productivity of the oil-cooled motor:
for example, taking a certain permanent magnet synchronous motor with a peak power of 170kW and a peak torque of 400Nm as an example, a relationship table of the rotation speed, the torque and the heat generation amount of the oil-cooled motor shown in table 2 can be obtained through an experimental calibration mode.
TABLE 2
Secondly, calibrating a relation table among the heat productivity of the oil-cooled motor, the temperature of lubricating oil flowing out of the heat exchanger, the working temperature of the oil-cooled motor and the flow of the lubricating oil:
illustratively, through an experimental calibration mode, a relation table among the heat productivity of the oil-cooled motor, the temperature of the lubricating oil flowing out of the heat exchanger, the operating temperature of the oil-cooled motor, and the flow rate of the lubricating oil shown in table 3 can be obtained.
TABLE 3
Specifically, as shown in fig. 3, step S204 includes S2041-S2044:
s2041, obtaining the heat productivity of the oil cooling motor according to the predicted working condition of the oil cooling motor.
Specifically, the heat generation amount of the oil-cooled motor can be obtained according to the rotation speed and the torque of the oil-cooled motor by looking up the table 2.
For example, if the rotation speed of the oil-cooled motor is detected to be 280rpm and the torque of the oil-cooled motor is detected to be 192Nm, the heat generation amount of the oil-cooled motor can be 2.1kW by looking up the table 2.
S2042, determining the actual working condition of the oil cooling motor according to the heat productivity of the oil cooling motor.
Specifically, if the calorific value of the oil-cooled motor is smaller than a preset threshold, the actual working condition of the oil-cooled motor is determined to be a first working condition, and otherwise, the actual working condition is determined to be a second working condition.
For example, assuming that the preset threshold is 3kW, since the heat productivity of the oil-cooled motor obtained by the lookup table 2 is 2.1kW and is less than 3kW, it may be determined that the actual working condition of the oil-cooled motor is the first working condition.
S2043, if the actual working condition of the oil-cooled motor is the first working condition, obtaining a flow control target of the lubricating oil according to the heat productivity of the oil-cooled motor, the temperature control target of the oil-cooled motor and the temperature control target of the lubricating oil, and controlling the rotating speed of the oil pump according to the flow control target of the lubricating oil.
Specifically, the flow control target of the lubricating oil can be obtained according to the heating value of the oil-cooled motor, the temperature control target of the oil-cooled motor, and the temperature control target of the lubricating oil by referring to the table 3.
For example, if the heat generation amount of the oil-cooled motor is 2.1kW through the lookup table 2 in step S2041, the temperature control target of the lubricating oil is 70 ℃ and the temperature control target of the oil-cooled motor is 130 ℃ in step S203, the flow rate of the required lubricating oil can be obtained through the lookup table 3, and thus the rotation speed of the oil pump can be adjusted according to the flow rate of the lubricating oil of 8.2L/min.
Further, on the basis that the working temperature of the oil-cooled motor is obtained through measurement of the second temperature sensor, closed-loop compensation can be performed on the heat productivity of the oil-cooled motor according to the working temperature of the oil-cooled motor, the compensated heat productivity of the oil-cooled motor is combined with a temperature control target of the oil-cooled motor and a temperature control target of lubricating oil, and a flow control target of the lubricating oil is obtained through query of a table 3.
That is, the heating value compensation amount is obtained from the temperature control target of the oil-cooled motor and the operating temperature of the oil-cooled motor, and the following description is made with respect to this step. Obtaining the heat productivity of the compensated oil cooling motor according to the heat productivity and the heat productivity compensation quantity of the oil cooling motor; specifically, the sum of the heat productivity of the oil-cooled motor and the heat productivity compensation amount is taken to obtain the compensated heat productivity of the oil-cooled motor. Obtaining a flow control target of the lubricating oil according to the compensated heat productivity of the oil cooling motor, the temperature control target of the oil cooling motor and the temperature control target of the lubricating oil; specifically, the flow control target of the lubricating oil is obtained by referring to the table 3 according to the compensated heat productivity of the oil-cooled motor, the temperature control target of the oil-cooled motor, and the temperature control target of the lubricating oil.
Specifically, as shown in fig. 4, the obtaining of the heating value compensation amount according to the temperature control target of the oil-cooled motor and the operating temperature of the oil-cooled motor includes:
according to the working temperature T of the oil-cooled motor0And the temperature rise delta T is used for obtaining the compensated temperature T of the oil-cooled motor. Specifically, the temperature rise delta T is used as negative feedback to obtain the working temperature T of the oil-cooled motor0And obtaining the compensated temperature T of the oil-cooled motor by the difference value of the temperature and the temperature rise delta T.
According to the temperature control target T of the oil-cooled motorrefAnd the compensated temperature T of the oil-cooled motor obtains the heating value compensation quantity delta P. Specifically, the compensated temperature T of the oil-cooled motor is used as negative feedback, and the temperature control target T of the oil-cooled motor is obtainedrefDifference value of compensated temperature T of oil-cooled motor, and calculating the difference valueAnd obtaining the heating value compensation quantity delta P after Proportional Integral (PI) adjustment. Wherein the temperature rise delta T is the compensation quantity delta P according to the calorific value and the specific heat capacity c of the stator core1And mass m1Specific heat capacity c of stator winding2And mass m2Specific heat capacity of rotor c3And mass m3Thus obtaining the product. In particular, c1*m1Represents the heat absorption of the stator core, c2*m2Representing the heat absorption of the stator winding, c3*m3Which represents the amount of heat absorbed by the rotor,indicating a differential adjustment.
From the above, it can be seen that the control of the operating temperature of the oil-cooled motor may be an open-loop control or a closed-loop control. Negative feedback is realized through closed-loop control, and the temperature control precision of the oil-cooled motor can be greatly improved.
S2044, if the actual working condition of the oil-cooled motor is the second working condition, the rotating speed of the oil pump is increased.
Further, the rotation speed of the oil pump can be adjusted to the maximum.
In addition, optionally, the speed of the water pump may be adjusted higher. Furthermore, the rotating speed of the water pump can be adjusted to the highest.
For example, if the actual working condition of the oil-cooled motor is the second working condition, the controller sends out a maximum heat dissipation instruction, and the rotating speeds of the water pump and the oil pump are adjusted to the highest rotating speed. For example, the oil pump speed is adjusted to 2700rpm and the water pump speed is adjusted to 2200 rpm.
And S205, controlling the rotation speed of the water pump according to the temperature of the cooling liquid flowing into the heat exchanger, the temperature of the lubricating oil in the oil collecting tank, the flow rate of the lubricating oil and the temperature control target of the lubricating oil.
Because the lubricating oil and the cooling liquid in the heat exchanger exchange heat, the flow of the cooling liquid is controlled by controlling the rotating speed of the water pump, and the purpose of controlling the temperature of the lubricating oil is achieved.
First, a table of relationships between the temperature of the coolant flowing into the heat exchanger, the temperature of the lubricating oil in the sump (i.e., the temperature of the lubricating oil flowing into the heat exchanger), the flow rate of the lubricating oil, the temperature of the lubricating oil flowing out of the heat exchanger, and the flow rate of the coolant is calibrated:
for example, taking a certain heat exchanger as an example, the temperature of the cooling liquid flowing into the heat exchanger is set to be 60 ℃, the temperature of the lubricating oil in the oil collecting tank is set to be 90 ℃, the flow rate of the lubricating oil is set to be 5L/min, and the relationship between the temperature of the lubricating oil flowing out of the heat exchanger and the flow rate of the cooling liquid is calibrated in an experimental manner. And regulating the flow of the lubricating oil to 10L/min, and calibrating the relation table between the temperature of the lubricating oil flowing out of the heat exchanger and the flow of the cooling liquid. By analogy, a relationship table like table 4 can be obtained. It should be noted that table 4 is only an example, and the calibrated data is different according to the control accuracy requirement.
TABLE 4
In addition, the data size of the relation table can be increased through an interpolation method, so that the precision of the relation table is improved.
Specifically, as shown in fig. 5, step S205 includes S2051-S2052:
and S2051, determining a flow control target of the cooling liquid according to the temperature of the cooling liquid flowing into the heat exchanger, the temperature of the lubricating oil in the oil collecting groove, the flow rate of the lubricating oil and the temperature control target of the lubricating oil.
The flow control target of the coolant refers to a flow control target of the coolant flowing out of the heat exchanger.
The controller may look up the relationship table by using the temperature control target of the lubricating oil as the temperature of the lubricating oil flowing out of the heat exchanger, and look up the table to obtain the flow rate of the corresponding cooling liquid as the flow control target of the cooling liquid. For example, assuming that the temperature of the coolant flowing into the heat exchanger at this time is 60 ℃, the temperature of the lubricating oil in the oil sump is 90 ℃, the flow rate of the lubricating oil is 10L/min, and the temperature control target of the lubricating oil is 70 ℃, it is possible to determine that the flow control target of the coolant is 10L/min.
And S2052, controlling the rotating speed of the water pump according to the flow control target of the cooling liquid.
The controller can adjust the rotating speed of the water pump according to the flow control target of the cooling liquid, so that the flow of the cooling liquid is controlled. As can be seen from the parameter table, once the flow rate of the coolant matches the target value, the temperature of the lubricating oil flowing out of the heat exchanger reaches the temperature control target.
From the above, it can be seen that the control of the temperature of the lubricating oil is an open loop control.
By controlling the temperature of the lubricating oil, the viscosity of the lubricating oil is kept moderate, the service lives of a bearing, an oil pump and the lubricating oil are prevented from being shortened due to overhigh oil temperature, and meanwhile, the resistance of the gear of the reducer is prevented from being increased due to overlow oil temperature.
Through the constant control of the working temperature of the oil-cooled motor, the magnetic field of the permanent magnet of the rotor is constant, so that the control precision of the output torque of the motor is improved by about 1.5 percent.
According to the oil-cooled motor control method provided by the embodiment of the application, when the heating capacity of the oil-cooled motor is higher than a rated value, the working temperature of the oil-cooled motor and the temperature of lubricating oil are reduced in advance by predicting the working condition of the oil-cooled motor, the large heating capacity operation of the motor can be met for a longer time, and the operation time of the motor under the severe working condition is prolonged.
For example, as shown in fig. 6, the temperature change curve of the oil-cooled motor at the peak power is shown. If the starting temperature of the oil-cooled motor is 130 ℃, the time to meet peak power operation is 35 s. If the starting temperature of the oil-cooled motor is 110 ℃, the time to meet peak power operation is 55s, which is extended by 20 s. That is, if the operating temperature of the oil-cooled motor is reduced from 130 ℃ to 110 ℃ in advance by predicting the operating condition of the oil-cooled motor, the time for the oil-cooled motor to meet the peak power operation may be extended from 35s to 55 s.
When the calorific capacity of the oil-cooled motor is lower than a rated value, the control precision of the motor temperature can be ensured, so that the torque output precision of the oil-cooled motor is improved. The temperature of the lubricating oil and the working temperature of the oil-cooled motor are constantly controlled.
For example, as shown in fig. 7, when the rotation speed of the oil-cooled motor is 4250rpm and the peak values of the three-phase output line currents are 544A, when the operating temperature of the oil-cooled motor is 60 ℃, the output torque of the oil-cooled motor is 231Nm, and when the operating temperature of the oil-cooled motor is 90 ℃, the output torque of the oil-cooled motor is 227Nm, that is, if the output torque of the oil-cooled motor is calibrated at 60 ℃, the torque of the motor actually operates at 90 ℃, the torque output is deviated by 1.73%.
According to the device and the method for controlling the oil-cooled motor, the temperature of lubricating oil in the oil collecting tank is obtained; predicting the predicted working condition of the oil-cooled motor according to at least one of the driving mode, the predicted road condition and the driving habit; determining a temperature control target of lubricating oil and a temperature control target of the oil-cooled motor according to the predicted working condition of the oil-cooled motor; controlling the rotating speed of the water pump according to the temperature of the cooling liquid flowing into the heat exchanger, the temperature of the lubricating oil in the oil collecting tank, the flow rate of the lubricating oil and the temperature control target of the lubricating oil; and controlling the rotating speed of the oil pump according to the rotating speed and the torque of the oil-cooled motor, the temperature control target of the oil-cooled motor and the temperature control target of the lubricating oil. The temperature of the lubricating oil in the oil-cooled motor is controlled, so that the working temperature of the oil-cooled motor is controlled.
Embodiments of the present application also provide a computer-readable storage medium having instructions stored therein, which when executed on a computer or a processor, cause the computer or the processor to execute the oil-cooled motor control method shown in fig. 2 to 4.
Embodiments of the present application also provide a computer program product containing instructions that, when executed on a computer or processor, cause the computer or processor to perform the oil-cooled motor control method shown in fig. 2-4.
The embodiment of the application provides a chip system, which comprises a processor and is used for executing the oil-cooled motor control method shown in fig. 2-4. For example, the temperature of the lubricating oil in the oil sump is acquired; predicting the predicted working condition of the oil-cooled motor according to at least one of the driving mode, the predicted road condition and the driving habit; determining a temperature control target of lubricating oil and a temperature control target of the oil-cooled motor according to the predicted working condition of the oil-cooled motor, wherein the temperature control target of the lubricating oil refers to a temperature control target of the lubricating oil flowing out of the heat exchanger; controlling the rotating speed of the oil pump according to the predicted working condition of the oil-cooled motor, the temperature control target of the oil-cooled motor and the temperature control target of the lubricating oil; and controlling the rotating speed of the water pump according to the temperature of the cooling liquid flowing into the heat exchanger, the temperature of the lubricating oil in the oil collecting tank, the flow rate of the lubricating oil and the temperature control target of the lubricating oil.
In one possible design, the system-on-chip further includes a memory for storing necessary program instructions and data for the oil-cooled motor temperature control device. The chip system may include a chip, an integrated circuit, and may also include a chip and other discrete devices, which is not specifically limited in this embodiment of the present application.
The computer storage medium, the computer program product, or the chip system provided in the present application are all used to execute the method for controlling the temperature of the oil-cooled motor described above, and therefore, the beneficial effects that can be achieved by the computer storage medium, the computer program product, or the chip system are referred to the beneficial effects in the above-mentioned embodiments, and are not described herein again.
It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus, and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the units is only one logical functional division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented using a software program, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions described in accordance with the embodiments of the present application are all or partially generated upon loading and execution of computer program instructions on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or can comprise one or more data storage devices, such as a server, a data center, etc., that can be integrated with the medium. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (18)

1. An oil-cooled motor temperature control device, comprising: the device comprises an oil pump, a heat exchanger, a water pump, a controller and an oil collecting tank; the oil collecting tank is used for collecting lubricating oil subjected to heat exchange in the oil-cooled motor; the oil pump is used for pumping the lubricating oil flowing inside the oil-cooled motor into the heat exchanger from the oil collecting tank and then refluxing the lubricating oil to the oil-cooled motor, and controlling the flow of the lubricating oil; the heat exchanger is used for carrying out heat exchange on the lubricating oil and cooling liquid; the water pump is used for controlling the flow of the cooling liquid in the heat exchanger; the controller is configured to:
acquiring the temperature of the lubricating oil in the oil collecting tank;
predicting the predicted working condition of the oil-cooled motor according to at least one of a driving mode, a predicted road condition and a driving habit;
determining a temperature control target of lubricating oil and a temperature control target of the oil-cooled motor according to the predicted working condition of the oil-cooled motor, wherein the temperature control target of the lubricating oil refers to a temperature control target of the lubricating oil flowing out of the heat exchanger;
controlling the rotating speed of the oil pump according to the predicted working condition of the oil-cooled motor, the temperature control target of the oil-cooled motor and the temperature control target of the lubricating oil;
and controlling the rotating speed of the water pump according to the temperature of the cooling liquid flowing into the heat exchanger, the temperature of the lubricating oil in the oil collecting tank, the flow rate of the lubricating oil and the temperature control target of the lubricating oil.
2. The apparatus of claim 1, wherein the oil-cooled motor temperature control apparatus further comprises a first temperature sensor disposed at a bottom of the oil sump to measure a temperature of the lubricating oil in the oil sump, the controller being configured to:
and acquiring the temperature of the lubricating oil in the oil collecting tank through the first temperature sensor.
3. The apparatus of claim 1, wherein the oil-cooled motor temperature control apparatus further comprises a second temperature sensor disposed within a stator winding of the oil-cooled motor to measure an operating temperature of the oil-cooled motor, the controller being specifically configured to:
acquiring the working temperature of the oil-cooled motor through the second temperature sensor;
and calculating according to the working temperature of the oil-cooled motor or inquiring a calibration table to obtain the temperature of the lubricating oil in the oil collecting tank.
4. The apparatus of claim 1, wherein the controller is specifically configured to:
determining a flow control target of the cooling liquid according to the temperature of the cooling liquid flowing into the heat exchanger, the temperature of the lubricating oil flowing into the heat exchanger, the flow rate of the lubricating oil and the temperature control target of the lubricating oil;
and controlling the rotating speed of the water pump according to the flow control target of the cooling liquid.
5. The apparatus according to any of claims 1-4, wherein the controller is specifically configured to:
obtaining the heat productivity of the oil cooling motor according to the predicted working condition of the oil cooling motor;
determining the actual working condition of the oil-cooled motor according to the heat productivity of the oil-cooled motor;
if the actual working condition of the oil-cooled motor is a first working condition, obtaining a flow control target of the lubricating oil according to the heat productivity of the oil-cooled motor, a temperature control target of the oil-cooled motor and the temperature control target of the lubricating oil, and controlling the rotating speed of the oil pump according to the flow control target of the lubricating oil; and if the actual working condition of the oil-cooled motor is the second working condition, increasing the rotating speed of the oil pump.
6. The apparatus of claim 5, wherein the controller is further configured to:
and if the actual working condition of the oil-cooled motor is the second working condition, increasing the rotating speed of the water pump.
7. The apparatus of claim 5, wherein the controller is specifically configured to:
obtaining heating compensation quantity according to the temperature control target of the oil cooling motor and the working temperature of the oil cooling motor;
obtaining the heat productivity of the compensated oil cooling motor according to the heat productivity of the oil cooling motor and the heat productivity compensation quantity;
and obtaining the flow control target of the lubricating oil according to the compensated heat productivity of the oil-cooled motor, the temperature control target of the oil-cooled motor and the temperature control target of the lubricating oil.
8. The apparatus of claim 7, wherein the controller is specifically configured to:
obtaining the compensated temperature of the oil-cooled motor according to the working temperature and the temperature rise of the oil-cooled motor;
obtaining the heating compensation amount according to the temperature control target of the oil cooling motor and the compensated temperature of the oil cooling motor;
and the temperature rise is obtained according to the heat productivity compensation quantity, the specific heat capacity and the mass of the stator core, the specific heat capacity and the mass of the stator winding and the specific heat capacity and the mass of the rotor.
9. The device of claim 5, wherein the heating value of the oil-cooled motor corresponding to the first working condition is lower than a first value, and the heating value of the oil-cooled motor corresponding to the second working condition is higher than a second value; the temperature control target of the lubricating oil corresponding to the first working condition is higher than the temperature control target of the lubricating oil corresponding to the second working condition, and the temperature control target of the oil-cooled motor corresponding to the first working condition is higher than the temperature control target of the oil-cooled motor corresponding to the second working condition.
10. An oil-cooled motor temperature control method applied to the oil-cooled motor temperature control device according to any one of claims 1 to 9, characterized by comprising:
acquiring the temperature of lubricating oil in the oil collecting tank;
predicting the predicted working condition of the oil-cooled motor according to at least one of the driving mode, the predicted road condition and the driving habit;
determining a temperature control target of lubricating oil and a temperature control target of the oil-cooled motor according to the predicted working condition of the oil-cooled motor, wherein the temperature control target of the lubricating oil refers to a temperature control target of the lubricating oil flowing out of a heat exchanger;
controlling the rotating speed of the oil pump according to the predicted working condition of the oil-cooled motor, the temperature control target of the oil-cooled motor and the temperature control target of the lubricating oil;
and controlling the rotating speed of the water pump according to the temperature of the cooling liquid flowing into the heat exchanger, the temperature of the lubricating oil in the oil collecting tank, the flow rate of the lubricating oil and the temperature control target of the lubricating oil.
11. The method of claim 10, wherein said deriving the temperature of the oil in the sump comprises:
and acquiring the temperature of the lubricating oil in the oil collecting tank through a first temperature sensor.
12. The method of claim 10, wherein said deriving the temperature of the oil in the sump comprises:
acquiring the working temperature of the oil-cooled motor through a second temperature sensor;
and calculating according to the working temperature of the oil-cooled motor or inquiring a calibration table to obtain the temperature of the lubricating oil in the oil collecting tank.
13. The method of claim 10, wherein the controlling the rotational speed of the water pump based on the temperature of the coolant flowing into the heat exchanger, the temperature of the lubricating oil in the oil sump, the flow rate of the lubricating oil, and the temperature control target of the lubricating oil comprises:
determining a flow control target of the cooling liquid according to the temperature of the cooling liquid flowing into the heat exchanger, the temperature of the lubricating oil flowing into the heat exchanger, the flow rate of the lubricating oil and the temperature control target of the lubricating oil;
and controlling the rotating speed of the water pump according to the flow control target of the cooling liquid.
14. The method of any one of claims 10-13, wherein said controlling the speed of the oil pump based on the predicted operating condition of the oil-cooled machine, a temperature control target for the oil-cooled machine, and a temperature control target for the lubricating oil comprises:
obtaining the heat productivity of the oil cooling motor according to the predicted working condition of the oil cooling motor;
determining the actual working condition of the oil-cooled motor according to the heat productivity of the oil-cooled motor;
if the actual working condition of the oil-cooled motor is a first working condition, obtaining a flow control target of the lubricating oil according to the heat productivity of the oil-cooled motor, a temperature control target of the oil-cooled motor and the temperature control target of the lubricating oil, and controlling the rotating speed of the oil pump according to the flow control target of the lubricating oil; and if the actual working condition of the oil-cooled motor is the second working condition, increasing the rotating speed of the oil pump.
15. The method of claim 14, further comprising:
and if the actual working condition of the oil-cooled motor is the second working condition, increasing the rotating speed of the water pump.
16. The method of claim 14, wherein the deriving the flow control target of the lubricating oil according to the heating value of the oil-cooled motor, the temperature control target of the oil-cooled motor, and the temperature control target of the lubricating oil comprises:
obtaining heating compensation quantity according to the temperature control target of the oil cooling motor and the working temperature of the oil cooling motor;
obtaining the heat productivity of the compensated oil cooling motor according to the heat productivity of the oil cooling motor and the heat productivity compensation quantity;
and obtaining the flow control target of the lubricating oil according to the compensated heat productivity of the oil-cooled motor, the temperature control target of the oil-cooled motor and the temperature control target of the lubricating oil.
17. The method of claim 16, wherein the deriving a heating value compensation amount according to a temperature control target of the oil-cooled motor and an operating temperature of the oil-cooled motor comprises:
obtaining the compensated temperature of the oil-cooled motor according to the working temperature and the temperature rise of the oil-cooled motor;
obtaining the heating compensation amount according to the temperature control target of the oil cooling motor and the compensated temperature of the oil cooling motor;
and the temperature rise is obtained according to the heat productivity compensation quantity, the specific heat capacity and the mass of the stator core, the specific heat capacity and the mass of the stator winding and the specific heat capacity and the mass of the rotor.
18. The method according to claim 14, wherein the heating value of the oil-cooled motor corresponding to the first working condition is lower than a first value, and the heating value of the oil-cooled motor corresponding to the second working condition is higher than a second value; the temperature control target of the lubricating oil corresponding to the first working condition is higher than the temperature control target of the lubricating oil corresponding to the second working condition, and the temperature control target of the oil-cooled motor corresponding to the first working condition is higher than the temperature control target of the oil-cooled motor corresponding to the second working condition.
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